mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
ec40d15d82
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
819 lines
22 KiB
C
819 lines
22 KiB
C
/*
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* Ogg bitstream support
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* Luca Barbato <lu_zero@gentoo.org>
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* Based on tcvp implementation
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*/
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/*
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Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "libavutil/avassert.h"
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#include "oggdec.h"
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#include "avformat.h"
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#include "internal.h"
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#include "vorbiscomment.h"
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#define MAX_PAGE_SIZE 65307
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#define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
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static const struct ogg_codec * const ogg_codecs[] = {
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&ff_skeleton_codec,
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&ff_dirac_codec,
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&ff_speex_codec,
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&ff_vorbis_codec,
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&ff_theora_codec,
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&ff_flac_codec,
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&ff_celt_codec,
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&ff_opus_codec,
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&ff_old_dirac_codec,
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&ff_old_flac_codec,
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&ff_ogm_video_codec,
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&ff_ogm_audio_codec,
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&ff_ogm_text_codec,
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&ff_ogm_old_codec,
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NULL
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};
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static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts);
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static int ogg_read_close(AVFormatContext *s);
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//FIXME We could avoid some structure duplication
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static int ogg_save(AVFormatContext *s)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_state *ost =
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av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams));
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int i;
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ost->pos = avio_tell(s->pb);
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ost->curidx = ogg->curidx;
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ost->next = ogg->state;
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ost->nstreams = ogg->nstreams;
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memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
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for (i = 0; i < ogg->nstreams; i++) {
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struct ogg_stream *os = ogg->streams + i;
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os->buf = av_mallocz(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(os->buf, ost->streams[i].buf, os->bufpos);
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}
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ogg->state = ost;
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return 0;
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}
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static int ogg_restore(AVFormatContext *s, int discard)
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{
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struct ogg *ogg = s->priv_data;
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AVIOContext *bc = s->pb;
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struct ogg_state *ost = ogg->state;
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int i;
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if (!ost)
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return 0;
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ogg->state = ost->next;
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if (!discard) {
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struct ogg_stream *old_streams = ogg->streams;
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for (i = 0; i < ogg->nstreams; i++)
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av_free(ogg->streams[i].buf);
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avio_seek(bc, ost->pos, SEEK_SET);
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ogg->curidx = ost->curidx;
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ogg->nstreams = ost->nstreams;
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ogg->streams = av_realloc(ogg->streams,
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ogg->nstreams * sizeof(*ogg->streams));
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if (ogg->streams) {
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memcpy(ogg->streams, ost->streams,
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ost->nstreams * sizeof(*ogg->streams));
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} else {
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av_free(old_streams);
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ogg->nstreams = 0;
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}
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}
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av_free(ost);
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return 0;
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}
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static int ogg_reset(AVFormatContext *s)
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{
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struct ogg *ogg = s->priv_data;
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int i;
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int64_t start_pos = avio_tell(s->pb);
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for (i = 0; i < ogg->nstreams; i++) {
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struct ogg_stream *os = ogg->streams + i;
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os->bufpos = 0;
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os->pstart = 0;
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os->psize = 0;
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os->granule = -1;
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os->lastpts = AV_NOPTS_VALUE;
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os->lastdts = AV_NOPTS_VALUE;
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os->sync_pos = -1;
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os->page_pos = 0;
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os->nsegs = 0;
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os->segp = 0;
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os->incomplete = 0;
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os->got_data = 0;
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if (start_pos <= s->data_offset) {
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os->lastpts = 0;
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}
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}
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ogg->curidx = -1;
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return 0;
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}
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static const struct ogg_codec *ogg_find_codec(uint8_t *buf, int size)
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{
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int i;
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for (i = 0; ogg_codecs[i]; i++)
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if (size >= ogg_codecs[i]->magicsize &&
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!memcmp(buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
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return ogg_codecs[i];
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return NULL;
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}
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/**
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* Replace the current stream with a new one. This is a typical webradio
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* situation where a new audio stream spawn (identified with a new serial) and
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* must replace the previous one (track switch).
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*/
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static int ogg_replace_stream(AVFormatContext *s, uint32_t serial)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os;
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unsigned bufsize;
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uint8_t *buf;
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const struct ogg_codec *codec;
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if (ogg->nstreams != 1) {
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av_log_missing_feature(s, "Changing stream parameters in multistream ogg", 0);
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return AVERROR_PATCHWELCOME;
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}
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os = &ogg->streams[0];
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buf = os->buf;
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bufsize = os->bufsize;
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codec = os->codec;
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if (!ogg->state || ogg->state->streams[0].private != os->private)
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av_freep(&ogg->streams[0].private);
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/* Set Ogg stream settings similar to what is done in ogg_new_stream(). We
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* also re-use the ogg_stream allocated buffer */
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memset(os, 0, sizeof(*os));
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os->serial = serial;
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os->bufsize = bufsize;
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os->buf = buf;
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os->header = -1;
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os->codec = codec;
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return 0;
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}
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static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
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{
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struct ogg *ogg = s->priv_data;
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int idx = ogg->nstreams;
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AVStream *st;
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struct ogg_stream *os;
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size_t size;
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if (ogg->state) {
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av_log(s, AV_LOG_ERROR, "New streams are not supposed to be added "
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"in between Ogg context save/restore operations.\n");
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return AVERROR_BUG;
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}
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/* Allocate and init a new Ogg Stream */
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if (av_size_mult(ogg->nstreams + 1, sizeof(*ogg->streams), &size) < 0 ||
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!(os = av_realloc(ogg->streams, size)))
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return AVERROR(ENOMEM);
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ogg->streams = os;
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os = ogg->streams + idx;
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memset(os, 0, sizeof(*os));
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os->serial = serial;
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os->bufsize = DECODER_BUFFER_SIZE;
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os->buf = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
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os->header = -1;
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os->start_granule = OGG_NOGRANULE_VALUE;
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if (!os->buf)
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return AVERROR(ENOMEM);
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/* Create the associated AVStream */
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st = avformat_new_stream(s, NULL);
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if (!st) {
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av_freep(&os->buf);
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return AVERROR(ENOMEM);
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}
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st->id = idx;
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avpriv_set_pts_info(st, 64, 1, 1000000);
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ogg->nstreams++;
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return idx;
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}
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static int ogg_new_buf(struct ogg *ogg, int idx)
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{
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struct ogg_stream *os = ogg->streams + idx;
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uint8_t *nb = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
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int size = os->bufpos - os->pstart;
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if (os->buf) {
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memcpy(nb, os->buf + os->pstart, size);
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av_free(os->buf);
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}
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os->buf = nb;
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os->bufpos = size;
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os->pstart = 0;
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return 0;
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}
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static int data_packets_seen(const struct ogg *ogg)
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{
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int i;
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for (i = 0; i < ogg->nstreams; i++)
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if (ogg->streams[i].got_data)
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return 1;
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return 0;
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}
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static int ogg_read_page(AVFormatContext *s, int *sid)
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{
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AVIOContext *bc = s->pb;
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os;
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int ret, i = 0;
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int flags, nsegs;
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uint64_t gp;
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uint32_t serial;
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int size, idx;
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uint8_t sync[4];
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int sp = 0;
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ret = avio_read(bc, sync, 4);
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if (ret < 4)
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return ret < 0 ? ret : AVERROR_EOF;
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do {
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int c;
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if (sync[sp & 3] == 'O' &&
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sync[(sp + 1) & 3] == 'g' &&
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sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
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break;
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c = avio_r8(bc);
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if (url_feof(bc))
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return AVERROR_EOF;
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sync[sp++ & 3] = c;
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} while (i++ < MAX_PAGE_SIZE);
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if (i >= MAX_PAGE_SIZE) {
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av_log(s, AV_LOG_INFO, "cannot find sync word\n");
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return AVERROR_INVALIDDATA;
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}
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if (avio_r8(bc) != 0) { /* version */
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av_log (s, AV_LOG_ERROR, "ogg page, unsupported version\n");
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return AVERROR_INVALIDDATA;
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}
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flags = avio_r8(bc);
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gp = avio_rl64(bc);
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serial = avio_rl32(bc);
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avio_skip(bc, 8); /* seq, crc */
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nsegs = avio_r8(bc);
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idx = ogg_find_stream(ogg, serial);
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if (idx < 0) {
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if (data_packets_seen(ogg))
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idx = ogg_replace_stream(s, serial);
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else
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idx = ogg_new_stream(s, serial);
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if (idx < 0) {
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av_log(s, AV_LOG_ERROR, "failed to create or replace stream\n");
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return idx;
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}
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}
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os = ogg->streams + idx;
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os->page_pos = avio_tell(bc) - 27;
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if (os->psize > 0)
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ogg_new_buf(ogg, idx);
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ret = avio_read(bc, os->segments, nsegs);
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if (ret < nsegs)
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return ret < 0 ? ret : AVERROR_EOF;
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os->nsegs = nsegs;
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os->segp = 0;
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size = 0;
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for (i = 0; i < nsegs; i++)
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size += os->segments[i];
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if (!(flags & OGG_FLAG_BOS))
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os->got_data = 1;
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if (flags & OGG_FLAG_CONT || os->incomplete) {
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if (!os->psize) {
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// If this is the very first segment we started
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// playback in the middle of a continuation packet.
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// Discard it since we missed the start of it.
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while (os->segp < os->nsegs) {
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int seg = os->segments[os->segp++];
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os->pstart += seg;
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if (seg < 255)
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break;
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}
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os->sync_pos = os->page_pos;
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}
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} else {
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os->psize = 0;
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os->sync_pos = os->page_pos;
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}
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if (os->bufsize - os->bufpos < size) {
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uint8_t *nb = av_malloc((os->bufsize *= 2) + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!nb)
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return AVERROR(ENOMEM);
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memcpy(nb, os->buf, os->bufpos);
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av_free(os->buf);
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os->buf = nb;
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}
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ret = avio_read(bc, os->buf + os->bufpos, size);
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if (ret < size)
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return ret < 0 ? ret : AVERROR_EOF;
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os->bufpos += size;
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os->granule = gp;
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os->flags = flags;
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memset(os->buf + os->bufpos, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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if (sid)
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*sid = idx;
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return 0;
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}
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/**
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* @brief find the next Ogg packet
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* @param *sid is set to the stream for the packet or -1 if there is
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* no matching stream, in that case assume all other return
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* values to be uninitialized.
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* @return negative value on error or EOF.
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*/
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static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize,
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int64_t *fpos)
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{
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struct ogg *ogg = s->priv_data;
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int idx, i, ret;
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struct ogg_stream *os;
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int complete = 0;
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int segp = 0, psize = 0;
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av_dlog(s, "ogg_packet: curidx=%i\n", ogg->curidx);
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if (sid)
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*sid = -1;
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do {
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idx = ogg->curidx;
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while (idx < 0) {
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ret = ogg_read_page(s, &idx);
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if (ret < 0)
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return ret;
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}
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os = ogg->streams + idx;
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av_dlog(s, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
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idx, os->pstart, os->psize, os->segp, os->nsegs);
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if (!os->codec) {
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if (os->header < 0) {
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os->codec = ogg_find_codec(os->buf, os->bufpos);
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if (!os->codec) {
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av_log(s, AV_LOG_WARNING, "Codec not found\n");
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os->header = 0;
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return 0;
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}
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} else {
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return 0;
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}
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}
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segp = os->segp;
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psize = os->psize;
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while (os->segp < os->nsegs) {
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int ss = os->segments[os->segp++];
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os->psize += ss;
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if (ss < 255) {
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complete = 1;
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break;
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}
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}
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if (!complete && os->segp == os->nsegs) {
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ogg->curidx = -1;
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// Do not set incomplete for empty packets.
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// Together with the code in ogg_read_page
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// that discards all continuation of empty packets
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// we would get an infinite loop.
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os->incomplete = !!os->psize;
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}
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} while (!complete);
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if (os->granule == -1)
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av_log(s, AV_LOG_WARNING,
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"Page at %"PRId64" is missing granule\n",
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os->page_pos);
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ogg->curidx = idx;
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os->incomplete = 0;
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if (os->header) {
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os->header = os->codec->header(s, idx);
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if (!os->header) {
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os->segp = segp;
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os->psize = psize;
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// We have reached the first non-header packet in this stream.
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// Unfortunately more header packets may still follow for others,
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// but if we continue with header parsing we may lose data packets.
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ogg->headers = 1;
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// Update the header state for all streams and
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// compute the data_offset.
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if (!s->data_offset)
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s->data_offset = os->sync_pos;
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for (i = 0; i < ogg->nstreams; i++) {
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struct ogg_stream *cur_os = ogg->streams + i;
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// if we have a partial non-header packet, its start is
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// obviously at or after the data start
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if (cur_os->incomplete)
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s->data_offset = FFMIN(s->data_offset, cur_os->sync_pos);
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}
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} else {
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os->nb_header++;
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os->pstart += os->psize;
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os->psize = 0;
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}
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} else {
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os->pflags = 0;
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os->pduration = 0;
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if (os->codec && os->codec->packet)
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os->codec->packet(s, idx);
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if (sid)
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*sid = idx;
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if (dstart)
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*dstart = os->pstart;
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if (dsize)
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*dsize = os->psize;
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if (fpos)
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*fpos = os->sync_pos;
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os->pstart += os->psize;
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os->psize = 0;
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if(os->pstart == os->bufpos)
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os->bufpos = os->pstart = 0;
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os->sync_pos = os->page_pos;
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}
|
|
|
|
// determine whether there are more complete packets in this page
|
|
// if not, the page's granule will apply to this packet
|
|
os->page_end = 1;
|
|
for (i = os->segp; i < os->nsegs; i++)
|
|
if (os->segments[i] < 255) {
|
|
os->page_end = 0;
|
|
break;
|
|
}
|
|
|
|
if (os->segp == os->nsegs)
|
|
ogg->curidx = -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ogg_get_length(AVFormatContext *s)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
int i;
|
|
int64_t size, end;
|
|
int streams_left=0;
|
|
|
|
if (!s->pb->seekable)
|
|
return 0;
|
|
|
|
// already set
|
|
if (s->duration != AV_NOPTS_VALUE)
|
|
return 0;
|
|
|
|
size = avio_size(s->pb);
|
|
if (size < 0)
|
|
return 0;
|
|
end = size > MAX_PAGE_SIZE ? size - MAX_PAGE_SIZE : 0;
|
|
|
|
ogg_save(s);
|
|
avio_seek(s->pb, end, SEEK_SET);
|
|
|
|
while (!ogg_read_page(s, &i)) {
|
|
if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
|
|
ogg->streams[i].codec) {
|
|
s->streams[i]->duration =
|
|
ogg_gptopts(s, i, ogg->streams[i].granule, NULL);
|
|
if (s->streams[i]->start_time != AV_NOPTS_VALUE) {
|
|
s->streams[i]->duration -= s->streams[i]->start_time;
|
|
streams_left-= (ogg->streams[i].got_start==-1);
|
|
ogg->streams[i].got_start= 1;
|
|
} else if(!ogg->streams[i].got_start) {
|
|
ogg->streams[i].got_start= -1;
|
|
streams_left++;
|
|
}
|
|
}
|
|
}
|
|
|
|
ogg_restore(s, 0);
|
|
|
|
ogg_save (s);
|
|
avio_seek (s->pb, s->data_offset, SEEK_SET);
|
|
ogg_reset(s);
|
|
while (streams_left > 0 && !ogg_packet(s, &i, NULL, NULL, NULL)) {
|
|
int64_t pts;
|
|
if (i < 0) continue;
|
|
pts = ogg_calc_pts(s, i, NULL);
|
|
if (pts != AV_NOPTS_VALUE && s->streams[i]->start_time == AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
|
|
s->streams[i]->duration -= pts;
|
|
ogg->streams[i].got_start= 1;
|
|
streams_left--;
|
|
}else if(s->streams[i]->start_time != AV_NOPTS_VALUE && !ogg->streams[i].got_start) {
|
|
ogg->streams[i].got_start= 1;
|
|
streams_left--;
|
|
}
|
|
}
|
|
ogg_restore (s, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ogg_read_header(AVFormatContext *s)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
int ret, i;
|
|
|
|
ogg->curidx = -1;
|
|
|
|
//linear headers seek from start
|
|
do {
|
|
ret = ogg_packet(s, NULL, NULL, NULL, NULL);
|
|
if (ret < 0) {
|
|
ogg_read_close(s);
|
|
return ret;
|
|
}
|
|
} while (!ogg->headers);
|
|
av_dlog(s, "found headers\n");
|
|
|
|
for (i = 0; i < ogg->nstreams; i++) {
|
|
struct ogg_stream *os = ogg->streams + i;
|
|
|
|
if (ogg->streams[i].header < 0) {
|
|
av_log(s, AV_LOG_ERROR, "Header parsing failed for stream %d\n", i);
|
|
ogg->streams[i].codec = NULL;
|
|
} else if (os->codec && os->nb_header < os->codec->nb_header) {
|
|
av_log(s, AV_LOG_WARNING, "Number of headers (%d) mismatch for stream %d\n", os->nb_header, i);
|
|
}
|
|
if (os->start_granule != OGG_NOGRANULE_VALUE)
|
|
os->lastpts = s->streams[i]->start_time =
|
|
ogg_gptopts(s, i, os->start_granule, NULL);
|
|
}
|
|
|
|
//linear granulepos seek from end
|
|
ogg_get_length(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
int64_t pts = AV_NOPTS_VALUE;
|
|
|
|
if (dts)
|
|
*dts = AV_NOPTS_VALUE;
|
|
|
|
if (os->lastpts != AV_NOPTS_VALUE) {
|
|
pts = os->lastpts;
|
|
os->lastpts = AV_NOPTS_VALUE;
|
|
}
|
|
if (os->lastdts != AV_NOPTS_VALUE) {
|
|
if (dts)
|
|
*dts = os->lastdts;
|
|
os->lastdts = AV_NOPTS_VALUE;
|
|
}
|
|
if (os->page_end) {
|
|
if (os->granule != -1LL) {
|
|
if (os->codec && os->codec->granule_is_start)
|
|
pts = ogg_gptopts(s, idx, os->granule, dts);
|
|
else
|
|
os->lastpts = ogg_gptopts(s, idx, os->granule, &os->lastdts);
|
|
os->granule = -1LL;
|
|
}
|
|
}
|
|
return pts;
|
|
}
|
|
|
|
static void ogg_validate_keyframe(AVFormatContext *s, int idx, int pstart, int psize)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
if (psize && s->streams[idx]->codec->codec_id == AV_CODEC_ID_THEORA) {
|
|
if (!!(os->pflags & AV_PKT_FLAG_KEY) != !(os->buf[pstart] & 0x40)) {
|
|
os->pflags ^= AV_PKT_FLAG_KEY;
|
|
av_log(s, AV_LOG_WARNING, "Broken file, %skeyframe not correctly marked.\n",
|
|
(os->pflags & AV_PKT_FLAG_KEY) ? "" : "non-");
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ogg_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
struct ogg *ogg;
|
|
struct ogg_stream *os;
|
|
int idx, ret;
|
|
int pstart, psize;
|
|
int64_t fpos, pts, dts;
|
|
|
|
//Get an ogg packet
|
|
retry:
|
|
do {
|
|
ret = ogg_packet(s, &idx, &pstart, &psize, &fpos);
|
|
if (ret < 0)
|
|
return ret;
|
|
} while (idx < 0 || !s->streams[idx]);
|
|
|
|
ogg = s->priv_data;
|
|
os = ogg->streams + idx;
|
|
|
|
// pflags might not be set until after this
|
|
pts = ogg_calc_pts(s, idx, &dts);
|
|
ogg_validate_keyframe(s, idx, pstart, psize);
|
|
|
|
if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY))
|
|
goto retry;
|
|
os->keyframe_seek = 0;
|
|
|
|
//Alloc a pkt
|
|
ret = av_new_packet(pkt, psize);
|
|
if (ret < 0)
|
|
return ret;
|
|
pkt->stream_index = idx;
|
|
memcpy(pkt->data, os->buf + pstart, psize);
|
|
|
|
pkt->pts = pts;
|
|
pkt->dts = dts;
|
|
pkt->flags = os->pflags;
|
|
pkt->duration = os->pduration;
|
|
pkt->pos = fpos;
|
|
|
|
return psize;
|
|
}
|
|
|
|
static int ogg_read_close(AVFormatContext *s)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
int i;
|
|
|
|
for (i = 0; i < ogg->nstreams; i++) {
|
|
av_free(ogg->streams[i].buf);
|
|
av_free(ogg->streams[i].private);
|
|
}
|
|
av_free(ogg->streams);
|
|
return 0;
|
|
}
|
|
|
|
static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index,
|
|
int64_t *pos_arg, int64_t pos_limit)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
AVIOContext *bc = s->pb;
|
|
int64_t pts = AV_NOPTS_VALUE;
|
|
int64_t keypos = -1;
|
|
int i;
|
|
int pstart, psize;
|
|
avio_seek(bc, *pos_arg, SEEK_SET);
|
|
ogg_reset(s);
|
|
|
|
while ( avio_tell(bc) <= pos_limit
|
|
&& !ogg_packet(s, &i, &pstart, &psize, pos_arg)) {
|
|
if (i == stream_index) {
|
|
struct ogg_stream *os = ogg->streams + stream_index;
|
|
pts = ogg_calc_pts(s, i, NULL);
|
|
ogg_validate_keyframe(s, i, pstart, psize);
|
|
if (os->pflags & AV_PKT_FLAG_KEY) {
|
|
keypos = *pos_arg;
|
|
} else if (os->keyframe_seek) {
|
|
// if we had a previous keyframe but no pts for it,
|
|
// return that keyframe with this pts value.
|
|
if (keypos >= 0)
|
|
*pos_arg = keypos;
|
|
else
|
|
pts = AV_NOPTS_VALUE;
|
|
}
|
|
}
|
|
if (pts != AV_NOPTS_VALUE)
|
|
break;
|
|
}
|
|
ogg_reset(s);
|
|
return pts;
|
|
}
|
|
|
|
static int ogg_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + stream_index;
|
|
int ret;
|
|
|
|
av_assert0(stream_index < ogg->nstreams);
|
|
// Ensure everything is reset even when seeking via
|
|
// the generated index.
|
|
ogg_reset(s);
|
|
|
|
// Try seeking to a keyframe first. If this fails (very possible),
|
|
// av_seek_frame will fall back to ignoring keyframes
|
|
if (s->streams[stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO
|
|
&& !(flags & AVSEEK_FLAG_ANY))
|
|
os->keyframe_seek = 1;
|
|
|
|
ret = ff_seek_frame_binary(s, stream_index, timestamp, flags);
|
|
os = ogg->streams + stream_index;
|
|
if (ret < 0)
|
|
os->keyframe_seek = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int ogg_probe(AVProbeData *p)
|
|
{
|
|
if (!memcmp("OggS", p->buf, 5) && p->buf[5] <= 0x7)
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_ogg_demuxer = {
|
|
.name = "ogg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Ogg"),
|
|
.priv_data_size = sizeof(struct ogg),
|
|
.read_probe = ogg_probe,
|
|
.read_header = ogg_read_header,
|
|
.read_packet = ogg_read_packet,
|
|
.read_close = ogg_read_close,
|
|
.read_seek = ogg_read_seek,
|
|
.read_timestamp = ogg_read_timestamp,
|
|
.extensions = "ogg",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|